Thanks for the query,Bruise
without any symptom are usually associated with low platelet.
Please get platelet levels checked.
Dont worry about the bruise.
Usually it takes around 2 weeks for the bruise to heal,
you can use oint thrombophobe to get a faster relief.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.